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I priced out the components today. The two inch plugs are $3.90, $7.80
for two. The threaded rod is $3.59 for 36 inches which I can cut to make
three pieces long to make three locking devices.  A self locking nut is
$0.45 and a regular nut is $0.11. So with sales tax the parts for the
locking mechanism come to $10.40 plus postage. If anybody is interested
let me know.

gl

Gary LaPook wrote:
> If you want to use the locking device that I came up with and you
> can't buy the components where you are I could purchase them here and
> ship them to you. The plugs cost about five dollars each, you need two
> of them, and I think the threaded rod was about the same. I think it
> would cost about twenty dollars for all the components including
> postage if anybody is interested.
>
> gl
> Wolfgang Hasper wrote:
>> I received a sample of those laminated paper tubes.
>>
>> The exterior surface is very smooth and even, rather matte than
>> glossy. I am sure it can be used to put on printed scales without
>> further treatment.
>>
>> By the way: I found white adhesive film in A4 size that can be used
>> in a laser printer.
>>
>> the interior surface is glossy, due to production on a core tube. (it
>> is a coiling production process. No noticeable seam or other
>> irregularity from the coil end on the outside though.)
>>
>> For ease of transport and to save on cost there the tubes should be
>> cut to length at the manufacturer's.
>> They provide precise cuts to right-angles which I think is a huge
>> benefit and valuable help for our futher work. I will shortly receive
>> information on the cutting cost.
>>
>> As I find only now those lengths are not sufficiently known yet.
>> RvR's paper gives account of the visible:
>>
>> inner tube        something > 230mm with 198 mm of scale intermediate
>> tube    225 mm
>> outer/cursor tube    222 mm (this is reliably the true length of the
>> tube)
>>
>> The intermediate tube will for sure extend into the base and end just
>> before the "upper" cursor cut-out (marked II). (assumed cursor tube
>> on zero stop) So the inner tube is visible there.
>>
>> The inner tube itself will be long enough to be sufficiently
>> stabilised when fully drawn out, yet short enough to leave some space
>> for the locking mechanism down in the base region (when slide rule is
>> fully closed)
>>
>> Assume the black base is a "cup" slipped on the end of the
>> intermediate tube.
>>
>> I will make a sectional drawing to determine the missing lengths and
>> post it for discussion. Any comments welcome.
>> Would you please tell me if anybody wants to have non-HR lengths?
>>
>> Wolfgang
>>
>>
>>
>>
>>
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